Stock breakdown — Available, Committed, On PO, Backordered

Key takeaway: Stock is split into four tiers so reorders run on your true position, not just on-hand.

The Inventory section of the SKU detail panel splits stock into four tiers so you can see exactly where every unit is:

• Available — physically on hand and free to sell. This is the figure Shopify shows on the storefront.
• Committed — units already attached to unfulfilled customer orders. Counted as sold from a forecasting standpoint, but still sitting in your warehouse until the order ships.
• On PO — units on open purchase orders not yet received. The expected-arrival date is shown on hover.
• Backordered — units customers have ordered that you couldn't fulfil. These are demand you owe and need to clear with your next inbound shipment.

Reorder calculations use all four — your effective stock position is Available + On PO − Committed − Backordered. Looking at on-hand alone is misleading once you have unfulfilled orders or POs in flight; the four-tier view is what the recommendations actually run on.